This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A171057 #13 Mar 31 2017 00:43:54
%S A171057 2,3,5,7,11,13,17,18,23,28,31,37,41,43,47,53,58,61,67,71,73,78,93,98,
%T A171057 87,101,103,107,108,113,127,131,137,138,148,151,157,163,167,173,178,
%U A171057 191,181,183,187,188,211,223,227,228,233,238,241,251,257,263
%N A171057 In the sequence of prime numbers, replace all the '9' digits with '8' and vice versa.
%H A171057 Vincenzo Librandi, <a href="/A171057/b171057.txt">Table of n, a(n) for n = 1..10000</a>
%t A171057 FromDigits[IntegerDigits[#] /. {9 -> p, 8 -> q} /. {p -> 8, q -> 9}] & /@ Prime[Range[60]] (* _Vincenzo Librandi_, Mar 01 2013, after _Harvey P. Dale_ in similar sequences *)
%o A171057 (PARI) a(n)=my(v=[0,1,2,3,4,5,6,7,9,8]);apply(k->v[k+1],digits(prime(n))) \\ _Charles R Greathouse IV_, Jul 16 2013
%K A171057 nonn,base,easy
%O A171057 1,1
%A A171057 _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010